Probably less than it feels like.
Possibly more than you would like.
The difficult part is that forgotten work is, by definition, hard to measure.
Start with the small stuff
You rarely forget an entire day.
They forget fragments.
A quick fix.
A short call.
A bit of preparation.
A revision that happened between two larger jobs.
These are easy to dismiss individually because the value of one item is small.
The monthly total is more interesting.
A simple exercise
For one week, keep a rough list of work you almost forgot to log.
Do not change your normal tracking habits yet.
Just notice the misses.
At the end of the week, add the time together.
Then multiply that by your hourly rate if the work would have been billable.
The number is not a scientific annual forecast.
It is a useful signal.
Example
Imagine you catch:
- 15 minutes Monday
- 20 minutes Tuesday
- 10 minutes Wednesday
- 25 minutes Thursday
- nothing Friday
That is 70 minutes.
At 100 per hour, that is about 117 in work.
Again, one week proves very little.
But if the pattern repeats, the forgotten work stops looking trivial.
Not everything should be invoiced
This is important.
A missed time entry is not automatically lost revenue.
You may intentionally include small support tasks.
You may work on fixed fees.
You may decide not to charge for certain conversations.
The useful question is not:
How much money did I definitely lose?
It is:
How much work am I doing without noticing it?
That is the part you can improve.
Make the invisible visible
Once you know which kind of work gets forgotten, the fix becomes easier.
Maybe calls are the problem.
Maybe Todoist tasks are fine, but small email jobs disappear.
Maybe meetings are well documented while after-meeting work is not.
You do not need a more complicated system everywhere.
You need a better safety net around the places where your current one leaks.